William Morelo was just 24 years old at the time of his death, his last fight he lost by unanimous decision against Argentinian prospect "Tigre" Saldivia, a fight that was shown on HBO PLUS to all of Latin America.He was killed by 2 professional hit men (sicarios), when he was entering his gym, close to the Miguel "Happy" Lora Coliseum, the killers then escaped the scene on a bike.

His Brother Wilson Morelo is a Pro Soccer player with one of the most powerful teams in Colombia, America de Cali.